一、程序结构图
二、程序代码
1.接口类UserManager.java
package com.my_spring;
public interface UserManager {
public void addUser(String username, String password);
public void deleteUser(int id);
public void modifyUser(int id, String username, String password);
public String findUserById(int id);
}
2.接口实现类UserManagerImpl.java
package com.my_spring;
public class UserManagerImpl implements UserManager {
public void addUser(String username, String password) {
System.out.println("-------UserManagerImpl.addUser()-------");
}
public void deleteUser(int id) {
System.out.println("-------UserManagerImpl.deleteUser()-------");
}
public void modifyUser(int id, String username, String password) {
System.out.println("-------UserManagerImpl.modifyUser()-------");
}
public String findUserById(int id) {
System.out.println("-------UserManagerImpl.findUserById()-------");
return null;
}
}
3.动态代理类SecurityHandler.java
package com.my_spring;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
public class SecurityHandler implements InvocationHandler {
private Object targetObject;
public Object newProxy(Object targetObject) {
this.targetObject = targetObject;
return Proxy.newProxyInstance(targetObject.getClass().getClassLoader(),
targetObject.getClass().getInterfaces(),
this);
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
checkSecurity();
Object ret = null;
try {
ret = method.invoke(this.targetObject, args);
}catch(Exception e) {
e.printStackTrace();
throw new java.lang.RuntimeException(e);
}
return null;
}
private void checkSecurity() {
System.out.println("--------checkSecurity()--------");
}
}
4.测试测序Client.java
package com.my_spring;
public class Client {
public static void main(String[] args) {
SecurityHandler handler = new SecurityHandler();
UserManager userManager = (UserManager)handler.newProxy(new UserManagerImpl());
userManager.addUser("木星人", "123");
}
}